Setup for siren, factory horn, and piezo

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=16526
Printed Date: July 15, 2025 at 10:25 AM

Topic: Setup for siren, factory horn, and piezo

Posted By: cpgoose
Subject: Setup for siren, factory horn, and piezo
Date Posted: July 21, 2003 at 2:02 PM

Hey....I have my factory horn hooked up to my alarm's siren (along with a relay and a flasher), so when my alarm goes off, the horn beeps as well. I'd also like to add a piezo siren in the interior of my car. Can I just tap into the siren's wire, or do I have to use another relay?

thanks!

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Replies:

Posted By: cpgoose
Date Posted: July 21, 2003 at 2:17 PM

Ok, so I took my own advice to do a more complete search, and found this post....so I guess I need a relay.

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Q: What's the best nation in the world?
A: Donation! Donate to the12volt.com

Posted By: xetmes
Date Posted: July 21, 2003 at 4:14 PM

How much current does the piezo draw? To be safe you can go with the relay but many small piezos dont hardly draw anything.

Posted By: cpgoose
Date Posted: July 22, 2003 at 6:27 AM

I'm not sure how much it draws....so I guess I should just use a relay. That's what I was hoping, though, that I could squeeze by without using one.

Oh so many relays posted_image

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Q: What's the best nation in the world?
A: Donation! Donate to the12volt.com

Posted By: cpgoose
Date Posted: July 24, 2003 at 2:09 PM

Does anyone think this could be using too much "juice" from the battery when the car is still off? In other words, the siren, the horn, and the piezo are all sounding....is this too much for the car to handle when it's not running?

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Q: What's the best nation in the world?
A: Donation! Donate to the12volt.com

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